http://apps1.eere.energy.gov/buildings/energyplus/
I am researching about this software at the moment and I am wondering :
Any response welcomed. Thanks.
I am a collaborative developer for the EnergyPlus engine through a research project. It is one of the most robust building energy simulation engines built on 30+ years of building science research. Unfortunately it isn't widely adopted due to a lack of a good, free GUI - however, this is changing with two DOE-sponsored GUI Projects:
http://openstudio.nrel.gov/
http://openrevit.com/2011/03/the-holy-grail-energyplus-gui-with-bim-integration/
EnergyPlus is widely used the research field for building energy and will most likely become a player in the building design and operations. Open Studio is an open source project (thus the reason for its name) developed in Ruby.